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Finding the Third Proportional to 318.50 and 478.50

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Solution

The third proportional to 318.50 and 478.50 is: 718.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.50 : 478.50 = 478.50 : x
  2. Step 2: Convert to fraction form
    318.50/478.50 = 478.50/x
  3. Step 3: Cross multiply
    318.50x = 478.50 × 478.50
  4. Step 4: Simplify right side
    318.50x = 228,962.25
  5. Step 5: Solve for x
    x = 228,962.25/318.50
  6. Step 6: Final answer
    x = 718.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.